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Acquisitions & Divestitures - Acquisitions (Details)
$ in Millions
6 Months Ended
Dec. 31, 2023
USD ($)
Jun. 30, 2023
USD ($)
acquisition
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Acquisitions        
Goodwill   $ 56,385 $ 55,949 $ 55,643
Software        
Acquisitions        
Goodwill   44,005 43,657 43,966
Consulting        
Acquisitions        
Goodwill   8,000 7,928 6,797
Infrastructure        
Acquisitions        
Goodwill   $ 4,380 $ 4,363 $ 4,396
2023 Acquisitions        
Acquisitions        
Percentage of business acquired (as a percent)   100.00%    
Number of acquisitions | acquisition   6    
Aggregate acquisitions cost   $ 423    
Cash consideration payable   42    
Goodwill   $ 301    
Estimated percent of goodwill deductible for tax purposes   0.00%    
Weighted average useful life   6 years 9 months 18 days    
2023 Acquisitions | Software        
Acquisitions        
Goodwill   $ 266    
2023 Acquisitions | Consulting        
Acquisitions        
Goodwill   23    
2023 Acquisitions | Infrastructure        
Acquisitions        
Goodwill   $ 12    
Apptio | Forecast        
Acquisitions        
Aggregate acquisitions cost $ 4,600